One verse

Srimad Bhagavatam 11.28.41

11.28.41

केचिद् देहमिमं धीरा: सुकल्पं वयसि स्थिरम् । विधाय विविधोपायैरथ युञ्जन्ति सिद्धये ॥ ४१ ॥

kecid deham imaṁ dhīrāḥ su-kalpaṁ vayasi sthiram vidhāya vividhopāyair atha yuñjanti siddhaye

kecit
some
deham
the material body
imam
this
dhīrāḥ
self-controlled
su-kalpam
fit
vayasi
in youth
sthiram
fixed
vidhāya
making
vividha
by various
upāyaiḥ
means
atha
thus
yuñjanti
they engage
siddhaye
for the achievement of material perfections

By various methods, some yogīs free the body from disease and old age and keep it perpetually youthful. Thus they engage in yoga for the purpose of achieving material mystic perfections.